Pet food biscuit



FIG. 1 is a front perspective view of a pet food biscuit showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a side elevational view thereof, the opposite side is a mirror image; and,

FIG. 5 is a front elevational view thereof, the rear is a mirror image. 

The ornamental design for a pet food biscuit, as shown and described. 